Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Fluid pressure discharge means
Reexamination Certificate
2002-10-18
2003-08-05
Evans, Robin O. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
Fluid pressure discharge means
C239S325000, C239S329000, C239S375000, C239S377000, C239SDIG001, C124S051100, C124S066000, C124S071000, C124S072000
Reexamination Certificate
active
06601780
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a paintgun with pneumatic feeding and discharging process, and more particularly, to a paintgun which controls the opening and closing of the airflow channel in such a way that the flow-field pressure is changed to complete two-stage feeding and discharging process.
2. Description of the Prior Art
A plurality of conventional paintguns (e.g. TW 447697, 443486, 406894, 437941, etc.), as shown in
FIGS. 1 and 2
, have a trigger assembly
11
above which a barrel assembly
12
is disposed. The barrel assembly
12
consists of an ejector tube
121
and an air chamber tube
122
both of which are in parallel with each other. A bore
13
is installed at the front end of the ejector tube
121
while a feeding tube
14
is fixed at the top thereof. The feeding tube
14
is connected with a loader to supply paintballs B. The air chamber tube
122
is fitted with an air valve
161
and an air valve spring
162
at the front end and with a delivery mechanism
17
at the rear end thereof. A hollow connector
18
is arranged at the bottom near the front end so as to be in connection with a tank
15
. A pull rod
19
is disposed within the barrel assembly
12
and the rear end thereof projects from the barrel assembly
12
.
Moreover, the pull rod
19
has a firing pin
191
within the air chamber tube
122
, and the firing hammer
191
is coupled with the pull rod
19
by means of an insertion bolt
193
. The front end of the firing hammer
191
is closed and pressed against the air valve
161
while the rear end thereof accommodates a spring
171
of a delivery mechanism
17
for pushing against the firing hammer
191
. The firing hammer
191
is provided with positioning groove
192
at the bottom thereof (see FIG.
3
). The movement of the firing hammer
191
can be controlled by an engaging member
111
of the trigger assembly
11
together with the positioning groove
192
, thereby reaching the firing effect. However, the contact surface of the engaging member
111
and the positioning groove
192
will be rubbed after discharge of the paintgun each time. Accordingly, the engaging effect of the engaging member
111
will be lowered gradually such that it's easy to cause a firing by mistake. The safety is much threatened. Moreover, the components of the conventional paintgun are numerous, and the connection thereof is complicated so that it's not easy for assembly and malfunction.
In addition, as shown in
FIG. 1
, the pull rod
19
has to be pulled backward in position in prior to discharge. During the discharge, it moves to and fro such that the rear member
194
projecting from the barrel easily injure the human body. It's much dangerous.
Furthermore, the bolt
193
is easily broken off due to the side shear force when different axial action forces are exerted on the firing hammer
191
and the pull rod
19
during to-and-fro movement.
As shown in
FIG. 2
, when the trigger assembly
11
is pulled to bring the firing hammer
191
together with the pull rod
19
forwards, the air valve
161
is pushed open by the firing hammer
191
, thereby releasing air pressure part of which flows into the air chamber tube
122
to return the firing hammer
191
in place and another part of which flows through a channel
123
and enters into the ejector tube
121
to discharge the paintball B. Accordingly, the air pressure used to discharge the paintball B has a curved and dispersed flow direction, thereby resulting in air turbulence. Therefore, the reduced air pressure can't bring the paintball B forward for discharge. Thus, the tank
15
has to be kept in a higher pressure. For example, most paintguns require a pressure at 50 kg/cm
2
for a smooth discharge of the paintball B to a prearranged distance. However, the higher the air pressure of the tank is, the more the cost thereof will be raised. Besides, the available air amount is also diminished and the danger is much elevated.
Consequently, the conventional paintgun leaves much to be improved.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a paintgun with pneumatic feeding and discharging process in which the paintball discharge is pneumatically controlled to replace the conventional mechanical way by engaging the firing hammer. Thus, the use safety is much ensured and the malfunction thereof is considerably reduced.
It is another object of the present invention to provide a paintgun with pneumatic feeding and discharging process which has advantages of simple configuration, easy assembly and low cost.
It is a further object of the present invention to provide a paintgun with pneumatic feeding and discharging process in which a limited amount of airflow is used to push a push tube forward first such that the paintball is brought forward to change the pressure of the front and rear ends of the flow-guiding valve. Accordingly, a great amount of airflow is brought through a major air channel for discharging the paintball. Thus, the present invention has advantages of smooth feeding of air flow. In addition, the paintball can be discharged by thrust of air flow even with smaller air pressure.
REFERENCES:
patent: 2631891 (1953-03-01), Kochner et al.
patent: 2721763 (1955-10-01), Miner
patent: 4628644 (1986-12-01), Somers
patent: 5333594 (1994-08-01), Robinson
patent: 5494024 (1996-02-01), Scott
patent: 6286497 (2001-09-01), Levkov
patent: 6371099 (2002-04-01), Lee
patent: 6405722 (2002-06-01), Colby
patent: 6532949 (2003-03-01), McKendrick
Evans Robin O.
Rosenberg , Klein & Lee
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